Railway-traffic-controlling apparatus



- March 19, 1929.

. R. GILSON RAILWAY TRAFFIC CONTROLLING APPARATUS Fil d April 17, 1928 f1 VQ- 5 5 T RA E g 12 g Q G Q/ Q I I y 16 I X 7 Y Ffi 25] Z0 F? 22 l? f1 19 f INVENTOR.

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Ma a/37 Patented Mar. 19, 19.29..

ROBERT M. eitson', or mmassenes, rsmsrtvtnm, nssrsno's "To the onion swIroH & SIGN-AI. onsumers amnnsrnvnmn.

wIssvAt'n, rsnnsstvnnrx, AT donronn'rlon or RAILWAY-archerImooncrnonnnre lirrnnnrnsj Application fired aprn *17, 192s. Serfal nma'za'see My invention relates to railway trafiic controlling apparatus of the type wherein train-carried governing mechanism is y con trolled energy received from the trackway. More particularly my invention relates to "what is known as coded train control systems. The present invention relates specifically to the 'trackway portion of such apparatus. v

My invention is an improvement on the apparatus shown in United 'StatesjLetters Patent No. 1,632,162, granted to C. Beall on June 14, 1927 I will describe one form of apparatus embodying my invention, and willthen point out the novel features thereof in claims,

The accompanying drawing is a diagrammati'c View showing one form OfapparatuS embodying my invention.

Referring to the drawing, the reference characters 1 and l designate the track rails of a railway along which traffi'c normally moves in the direction indicated by the arrow. These rails are divided by insulated joints 2 into a plurality of track sections, of which only one section A-B is shown in the'drawing; v

Located at theentrance-end of the section A"B is a centrifugal track relay R comprising two windings 4c and '5,'the former-of which is constantlyeenne'cted with the'trackrails 1 and 1 and the latter of which is supplied with alternating"four-rent by means which will be explained hereinafter. This track relay also comprises a rotor 6, a centrifu'gal device 14 operated by the rotor 6, and two contacts 7 and 20 controlled by the V centrifugal device 14:.

The track relay R controls a coder relay F, which in turn controlsa coder 1), both of which are located adjacent the exit end of section AB. The coder D may be of any I suitable type, such, for example, as that shown in application for Letters "Patent o f the United States filed *by N. Bossar't 011 Feb. 7, 1927, Serial No; 166,467. This coder comprises an operating wind'in'g 15, and two contacts 16 and 17 which are periodically closed while the coder is in operation, the

' frequency of operation of contact 16 being different from that of contact 17.

Also located adjacent the exit end of the section A'B are two sources of current difiering in frequency. As here shown,

quencies of the currents track rails AB by a these sources "are a transformer 0 and-a transformerfi the-primaries of which are connected with "alternating current gen-era'- tors, not shown in the "drawing. The fre- I delivered by these transformers,inay, for example, be cycles per second and 100 "cycles-:pfer second, re speetively, although I do not wish to be limited to theseparticul'ar frequencies.

VVh'en the coder relay F is energized,

cycle current is constantly supplied to the seconcl'ary13 of which is connected across the'rails"ad acent :the' exi-tend of the section through a limiting impedance 3.

left-hand terminal of the secondary of trans former C through the front point of contact 19 of'tliecoderre'lay F, and the primary 12 or transformer T to the righ-t hand terminal of the secondary of transformer C;

It will be seen, "therefore, that. under nor- I mal conditions, that-is, 'when-thejtrack sec ti'on A supplied to both windings 4' and I 5 of relay R ,:a-nd so -this relay is efiectively energized to h ol'd its front contacts closed andits back contacts open.

When the weer/relay r isv dc-energized,

the 60 cycle source is disconnected from n 'Ihepri-j mary circuit ror transformer T rs from -the' is unoccupied, =60 cycle current is "'65 transformer T, the

transformers- I and E, andcycle current is supplied to the coder 1) through back contact ls of coder relay F, sothat the;

coder is set into-operation. One hundred cyclecurrent is then supplied to .transform-' ers T-andl lthrough-the hack contact 18 of" coder relay-F, contact 16 or 17' of coder D,

front point or back point or contact 23 of track relay R for the section next in advance of section A-B,

and the back point of'contact 19 of coder relay F. It followsx that under this condition 100 cycle' current, periodically interrupted at one rate or an? other, is supplied to the rails-of sec't-i-onv A-l3 and also to R the rate of interruption-0 f this "cur rent depending on whether track relay R is energized or de energized.

Heretofore in systems of'this character it hasbeen customary to control the: coder rewinding 5 of track relay R so that this coder relay is normally dethe winding of relay F, which shunt passes from terminal X, through of relay G, resistance energized, but is energized when the back contact of the track relay becomes closed due to a train entering the section. On account of the time required for the closing of the back contact of a centrifugal relay after it has been shunted by a train, this means for controlling the-coder relay is unsatisfactory, because it introduces an undesirable delay in the application of thev coded current to-the track rails after a train enters the section. In accordance with my invention, therefore, I control the coderrelay F by a front pointof contact 7 of the track relay B, so that this coder relay is normally energized and becomes de-energized as soon as the front contact of the track relay opens. It follows-that the delay referred to above in the application of the coded current in the track rails is eliminated'. As. shown in the drawing, the main circuit for coder relay F is from terminal X of a suitable source of current, through the front point of contact 7 of relay R and the winding of coder. relay F to terminal Y of the same source of current.

WVith only the apparatus thus far referred to, the restoration of the track circuit to its normal condition after a train leaves sec.- tion AB would be less satisfactory than when the coder'relay is normally de-energized and is controlled by a back contact of the track relay. I have accordingly provided means for de-energizing the coder relay F as soon as the back contacts of the track relay It open when the latter relay becomes energized due to a train passing out of the section. As here she-v11, I accomplish this by the provision of theslow-releasing relay G, having a circuit which is closed when the back point of contact 7 of track relay R 'becomes closed. Coder relay F is provided with an auxiliary circuit which passes front contact 21 22 and the winding of coder, relay F to terminal Y. This auxiliary circuit is provided with a shunt around from resistance 22, through back contact 20 of track relay B to terminal Y.

The operation of the apparatusfor controlling the coder relay F, is vas follows: When a train enters section AB, track relay R becomes ole-energized, and as soonas the front point of contact7 of this relay opens, the coder relay F becomes de-energizedto apply the coded train governing current to the rails of'the section. When the back point .of contact 7 of a track relay R closes, relay G becomes energized, but relay F is not affected because it is shuntedv by back contact-20 of relay R which contact is then closed. Vvhen the train passes out of section AB, relay R again becomes energized, and as soon as back contact 20 opens, the shunt around relay F in the auxiliary circuit for this relay becomes open, so that relay Fbecomes energized by virtue of the circuit through contact 21, of relay G and resistance 22. The slow-releasing characteristic of relay G is such that the front contact-21 of this relay remains closed until after the front point of contact 7 of track relay R closes. It follows that when the trainv leaves the section, the coder relay F immediately becomes energized and 'continues to be energized as lay R is energized. There is, therefore, no delay in the application of the coded train governing current to the rails when a train enters the section, and'there is no delay in the restoration of the track circuit to its normal condition after a trainleaves the section.

Although scribed only one ing my invention, rious changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:

1. In combination, a section of railway track, a centrifugal track relay having. a controlling winding connected with the rails of said section, a coder relay, a circuit for said coder relay including a front contact of said centrifugal relay whereby said coder relay is normally. energized, a slow-releasing relay having a circuit including a back contact of said centrifugal relay whereby said slow-releasing relay is gized, an auxiliary circuit for said coder relay including a front contact of saidslow- I have herein shown and deform of apparatus embody.-

vreleasing relay, a shunt for said auxiliary circuit around the ,coder relay and including a back contact of and means including a coder controlled by said coder relay for supplying the rails of said section with track circuit current when the coder relay is energized and with coded train governing current when the coder relay is de-energized.

2. In combination, a section of railway track, a centrifugal track relay having a controlling winding connected with the rails of said section, a coder relay, means CO'II'? trolled by said centrifugal relay for de-energizing said coderrelay as soon as the front contact of the centrifugal relay opens and for again energizing the coder relay as soon asa back contact of the centrifugal relay opens, and means includinga coder controlled by said coder relay for supplying the rails of said section with track circuit current when the coder, relay is energized and with coded train governing current when the coder relay is (lo-energized.

it is understood that vasaid. centrifugal relay,

long as track re-.'

normally de-ener- 3. In combination, a section of railway track, a centrifugal track relay having a controlling Winding connected With the rails v of said section, a coder relay means controlled by said track relay for normally en-' ergizing said coder relay but for de-energizing the coder relay as soon asthe front contact of the track relay opens, means also controlled by said track relay for again en- 10 ergizing said coder relay as soon as the back contact of said track relay o'pens and means including a coder controlled by said coder v relay for supplying the rails of said section With track circuit current When the coder relay is energized and With coded train governing current When the coder relay is (ls-energized.

In testimony whereof I aflix my signature.

ROBERTVM. GILSON; 

